/Engine/Source/Runtime/Engine/Public/AudioDevice.h
Gets all Subsystems of specified type, this is only necessary for interfaces that can have multiple implementations instanced at a time. Do not hold onto this Array reference unless you are sure the lifetime is less than that of the audio device
template<typename TSubsystemClass> const [TArray](API\Runtime\Core\Containers\TArray)< TSubsystemClass * > & GetSubsystemArray() const